MOSCOW, February 4, 2026 - RUSAL, a leading global aluminium producer, has unveiled a breakthrough in a composite material for 3D printing. The new metal matrix composite designated RS-770K offers a tensile strength 30% greater than that of the strongest aluminium powder alloys, opening new frontiers for additive manufacturing in high-performance applications.
Developed in-house, the RS-770K composite combines an aluminium matrix with ceramic particles, achieving a remarkable tensile strength of 615 Megapascals (MPa). This represents a 30% increase over the RS-553 alloy—the strongest aluminium powder alloy in RUSAL's portfolio, which contains a high percentage of the rare-earth metal scandium.
The material's unique properties bridge a critical gap in additive manufacturing in retaining the signature lightness of aluminium, and its strength characteristics mark a significant step toward those of steel and titanium alloys. Aluminium is one of the lightest structural metals, approximately three times lighter than steel and one-and-a-half times lighter than titanium.
RS-770K is the first 3D-printing composite developed by RUSAL's R&D Department. Previously, the department created more than ten aluminium alloys for additive manufacturing, all designed to enhance key properties—such as strength, heat resistance, and yield strength—beyond those of the industry-standard AlSi10Mg powder alloy.